Syringe construction



April 25, 1950 A. E'. sMl'rH 2,505,307

' 4 SYRINGE CONSTRUCTION Filed June 12, 1947 f, f6 f 44 /IIIIIIIIIIIIIIIIIJIIIL 'I1 III/ll. 'Ill lll I4 f l INVENToR. f Anf/MPE 9M/r# Patented Apr. 25, V1950 Theigeneral; object. .ofthe nvnin .1S n privi-4 vidwaenovel; syringe; construction; whereiira re=` useable.barreris emhlyed; coniunctionifwitnf aadisposableeneedle.icarrvngg moule;

A; further. object". ofthem invention 1S.. liv llrovidei a novel disposablev needle;suppomiihglmedicament containing, ampule...

Another. .ohjectipof the, invention;- isxtozprovide. a,Ik novel rear. .closure-f member. forfi'alrmlzll;

barrel;

Other. objects.. and; advantagesnmyfimentmri willLpbe apnarentirom; the; folle',wil-figg,descanori-.orl-Ak taken.. in. connection,. with the: acoomhanyinar" diawings, wherein z. n

Eig. I lis a side. elevation sliowinga1r""'emmulek embodying the featuresofmy' invention? Eig.. 2`i"s anextended; side, elevation oftllet` ampule. barrelandlclosure. member?,

Eig,l 3; an enlarged section 2takerroirilrlet 3:35; Fig.. l';.. f

Fig; 4' i's` a .fragmentarx'central' sectional? view" showing, theharrelwitli the ampule thereir' Figg. 51 is.. an extended..longitudinarisectionai" View showing thebarrelwith theanmuleseaiiedtherein., andwiththe parts; tliepositiorr taken: afterthe, contente; ofthe ampuie; liaveebeen: disohargedl; andi` Referring to the. drawing reierenedcharacf tera; I'lhave shown. my. invention as; embodied in syringe which isindi'cated generallyjat Hf.'-

As Shownth'e. syrl'gefic'lllds" ariel Hi, af' rear.. member: |12" anda; disposab minute; |31' Tliebarrel, I l' maxb'er madeiof'silita. auch. asmetaLgplastanet cetera'. Th barrelis' generallyy cylir'idri'oalimasV at' i.4`,^ `with'f=fa rounded and tapering, front. end., llandiwithgan;enlarged rear endlV I-Giwhichiprvides,aehonligr l'.' On the barrel I provide aefl'ngei; engagingiiange, 18;. which-may be -hexagonaltin shape soylpliat'll'"will' not roll'when laid down. The ldarrellis provided` with aligned view-ing ,apezitumsz-as'ehown. n

The rear. member I2 includes a -plunger .20 which has a^ reduced th1ead`ed^f ront and.

' an enlarged. shoulder 22 at theirmer end oiftlfief.

threaded portion.v Theerwardfaoeffothe s-ho'ul-v der 22 iscupped as at 23, .(Figf:;5) so'thatitiwillmore. tightlyv engage a; pieton cerkljotoihelater: described.. The. rear end of' f limanda; is.; moulded. :with a.. thnnzlb. nieoefzM-whicn; be, threaded to engage threads 25 on lonresefzisr tending; sleeve-Zitz reduced as at Siifin' arrivano@I of? theethreadsmhereon and'- t-he'- reduced por-tionaivriclud'esel @Lentini-1v ternal ange'v` 32. threads 34" thereon,` is arrangedf to slide within the'- sleeve 281' andJ- is engaged/and' normally urgedi centering`- member 361 has threads.` 3113i thereonj,f.

which engage the threads 3421 onA thesleeveV 323i;

' The'v centering nleitciberrA siidesalong. they plunger the' plunger. 55 front end of the barrel. `The closure 2D and extendeiorwardh and rearfwavrdliyv of yits barrel and isfprovided' with a taperirxg forward; end-"39' which-.centers and? holdsfthfei ampuiell in:v the barrel against lateral movement:

The` ampule Vl-3 is made off transparent; materiaisuchv as fglassor plasticl and i'spreferably eylinf-eY drieal' throughout; It has' af piston- MJ"tllereint-v` which is-preferablymade offrubber; Thefpi'siom hasj a recesslf' therein andf has a threaded* nuil F2 cast in the piston inL alignmentvvitll'-theL rek..1V cessgdl; recessl 53't and the?. body of`- the/piston includes: peripheral grooves 44 which mayX contain lulorliaV cant ifd'esired. The" front4 andi rear-periplfieries; oithei piste-narerounded-"as at 462 The ampuleis'fprovidedwith-a stopper-4&1 Th@ stopperl'ia-sfront' and rear coaxial recesses and wit-hafdiezphragm'- 49l'therebet`ween. Im advance'of'thezstopper Ifprovide arubber closure` which comprises a body 5% vviialiiir-theampulieey having" a;v shonider 5lv thereonA and' havingI emtip-A 5.2whicli is engaged' lovV angel'ongated'f'fl'exiblefcan 531,. The; closure includescoaxial vrecesses Edfeand 55with a diaphragm 56'5 t-l'ierebetween;V The-reTY cesses' 55"' and 41' are aligned.

The .tip..52 includesA an end serniehemif'sphe'rioa'll necess. 51; adapted 'to receive' a sphere 581 oma: needle; se? The needre 5.9. inmamarpesiticmbe@v fore ueehas. its inner. cmi lidisposed" inftheqree ceseeev 554; and 5.5 andpasses through th dini-r the...need1e,isiprotected against. contamination;

. In, use the rear.. member, .12.515, moved; from the barrel-and there/moule insert d' theouteren the needle being arrangedllnaxhajee @Zinn `a iris-then A' sleeve# 33%v having j inter-nai#v The` front endr-of the pistoniholudesiw moved into place thus advancing the ampule so that the needle is moved into the ampule by engagement of the sphere 58 with the barrel. This causes the inner end of the needle to pierce the diaphragm 49, thus placing the inner end of the needle in communication with the contents of the ampule. The threads 2S and 30 are then engaged, the spring 35 having pushed the centering member head 23 into engagement with the end of the ampulev to center the ampule.

The plunger 20 is then rotated so that the threads 2l thereon engage the threads in the nut 42 so that the plunger is locked to the piston.-

The operator then inserts the needle in the patient and moves the piston slightly forward and then withdraws the piston. If blood appears in the ampule he will know that a blood vessel has been penetrated and the needle will be withdrawn and reinserted, as injections should not be made in a blood vessel. After the needle is correctly inserted the plunger 2t is gradually moved forward until the desired injection has been made. the inner pointed end of the needle will be disposed in the recess i3 of the piston,

In seating the ampule in the barrel the taper on the interior of the front member serves tok guide the needle 59 into the hole 62.

From the foregoing description it-will be apparent that I have invented a novel syringe construction, the parts of which can be economically manufactured and which are highly efficient for the intended purpose.

Having thus described my invention, I claim 1. A syringe including a reusable barrel and a disposable ampule, said barrel comprising a tubular body having a tapering front end and having an open rear end, a closure engaging the barrel rear endfa plunger slidable through said closure, said plunger having a threaded front end and having an enlarged, cupped shoulder adjacent to the threads thereon, said closure having a forwardly projecting sleeve threaded to receive internal threads on said barrel, the forward portion of said sleeve being cylindrical and of a reduced diameter and being slidable within the barrel, said sleeve having an internalr ange on the inner end thereof, a collar slidable within said sleeve, said collar having internal threads, a spring engaging said collar and said closure to urge the collar forwardly along the sleeve, a tubular centering member having threads intermediate the length thereof and engaging the threads on said collar, said centering member having a cupped forward end adapted to engage an ampule in the barrel, and an ampule in said.

barrel, said ampule being cylindrical and having a piston cork in the rear thereof, said piston cork having a recess therein and having a threaded member in said recess engageable by the threaded end of the plunger, a stopper in the forward por-v tion of said ampule, said stopper member having outer and inner axial recesses with a diaphragm betweensaid recesses, a closure at the forward end of said ampule, said closure having aligned inner and outer axial recesses, a diaphragm between said closure recesses, a needle having a protuberance thereon and having an outer portion and an inner end portion disposed in said closure recesses and extending through said closure diaphragm, said needle extending into said outer recess on said stopper and being spaced from the diaphragm on said stopper, said closure having va projecting tip adapted to receive a. needle protecting cap.

When the piston is fully advancedl 2. A syringe including a reusable barrel and a. disposable ampule, said barrel comprising a tubular body having a tapering front end and having an open rear end, a closure engaging the barrel rear end, a plunger slidable through said closure, said closure having a forwardly projecting sleeve threaded to receive internal threads on said barrel, the forward portion of said sleeve being cylindrical and of a reduced diameter and being slidable within the barrel, rsaid sleeve having an internal flange on the inner end thereof, a collar slidable within said sleeve, said collar having internal threads, means to urge the collar forward- .ly alongV the sleeve, a tubular ampule holding thereof and engaging the threads on said collar,

vand an ampule in said barrel, said ampule being cylindrical' and having a piston in the rear thereof, said plunger being adapted to engage the piston, a stopper in the forward portion of said ampule, said stopper having an axial recess, a closure atthe forward end of said "ampule, said ampule closure having aligned inner and outer axial recesses, a diaphragm between said ampule closure recesses, and a needle having a protuberance thereon and having an outer portion and an inner end portion disposed in said ampule closure recesses and extending through said closure diaphragm, said needle extending into said outer recess on said stopper and being spaced from the diaphragm on said stopper.

3. A syringe including a reusable barrel and a disposable ampule, said barrel comprising a tubular body having a tapering front end and having an open rear end, a closure engaging the barrel rear end, a plunger slidable through said closure,

said closure having a forwardly projecting sleeve threads intermediate the length thereof and en gag-ing the threads on said collar, said centering member having a cupped forward end adapted to engage an ampule in the barrel, and an ampule in said barrel, said ampule being cylindrical and having a piston in the rear thereof, said piston being engageable by the plunger, a stopper inthe forward portion of said ampule, said stopper member having outer and inner axial recesses with a diaphragm between said recesses, a closure at the forward end of said ampule, said ampule closure having aligned inner and outer axial recesses, a needle having a protuberance thereon and having an outer portion and an inner end portion disposed in said ampule closure recesses, said needle extending into said outer recess on said stopper and being spaced from the diaphragm on said stopper.

, ARTHUR E. SMITH.

REFERENCES CITED Thec'following references are of record ln the file of tlfiisfpaten-t:- 1 1 r UNITED S'IA'IES PATENTS l' l\lurnb er` I Name Date 1,604,018 Brockway Oct. 19, 1926 1,718,602 Smith June 25, 1929 2,925,751 Barron Jan. za, 1936V 

